CVE-2021-47453

In the Linux kernel, the following vulnerability has been resolved: ice:
Avoid crash from unnecessary IDA free In the remove path, there is an
attempt to free the aux_idx IDA whether it was allocated or not. This can
potentially cause a crash when unloading the driver on systems that do not
initialize support for RDMA. But, this free cannot be gated by the status
bit for RDMA, since it is allocated if the driver detects support for RDMA
at probe time, but the driver can enter into a state where RDMA is not
supported after the IDA has been allocated at probe time and this would
lead to a memory leak. Initialize aux_idx to an invalid value and check for
a valid value when unloading to determine if an IDA free is necessary.